mergeImageLayers

Merges image layers into one. This method is useful when working with image
formats that use multiple layers such as PSD. The merging is controlled using
the layer_method which defines how the layers are merged.
Available since 6.3.7

Layer method type

Merges image layers into one. This method is useful when working with image
formats that use multiple layers such as PSD. The merging is controlled using
the layer_method which defines how the layers are merged.
Available since 6.3.7